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Forward-Flyback Converter with Active Clamp

A converter and clamping capacitor technology, applied in the field of forward-flyback converters, can solve problems such as conduction loss

Active Publication Date: 2011-12-28
DELTA ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the active-clamp forward-flyback converter is operating at light load, the two branches of the secondary side have current flowing, which causes unnecessary conduction loss
In Intel's latest voltage regulation module (Voltage Regulator Module, VRM) specification (VRM / EVRD11.1), it stipulates the requirements for improving the efficiency under light load, although the communication and network systems currently using isolated power converters Or other industrial fields have not yet established this specification, but it is very likely that this requirement will be raised in the near future

Method used

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  • Forward-Flyback Converter with Active Clamp
  • Forward-Flyback Converter with Active Clamp

Examples

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Embodiment Construction

[0023] image 3 It is a schematic circuit diagram of a buck-boost active clamp forward-flyback converter according to the first preferred embodiment of the present invention, which includes a buck-boost active clamp forward-flyback DC-DC converter and a control circuit , through the control circuit, the output voltage regulation of the DC-DC conversion circuit and the quick response function under the dynamic load change can be realized. The polarity of the voltages and the direction of the currents in this active clamp forward-flyback converter are defined in image 3 middle. Transformer T is the key to continuously transfer the input energy to the output terminal through the secondary side winding of the transformer and implement the flyback sub-circuit under light load. r , the transformer has a primary winding N 1 , the first secondary side winding N 2 and the second secondary winding N 3 , the winding N 2 and the winding N 3 Wound on the secondary side and designed...

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Abstract

The invention discloses a forward-flyback converter with an active clamping circuit. The secondary side output of the converter comprises a flyback sub-circuit operating in a continuous conduction mode and a forward sub-circuit operating in a non-continuous conduction mode. Under over-load output, the converter uses a zero voltage switching mechanism of an active clamping flyback sub-circuit to provide sufficient resonance current; and under light-load output, the converter prolongs the time that the resonance current is converted from negative current into positive current to ensure that a switch realizes zero voltage switching, and reversal of biasing of a diode of the flyback sub-circuit is designed, so that the sub-circuit can not continue to work and unnecessary element power loss canbe reduced. Thus, the converter can simultaneously take account of the conversion efficiencies of over-load output and light-load output under a wide load fluctuation range.

Description

technical field [0001] The invention discloses a forward-flyback converter (forward-flyback converter) with an active clamping circuit, in particular to a conversion used for both heavy-load and light-load output in a wide load range. Efficient and cost-effective isolated flexible switching DC-DC converter. Background technique [0002] Due to the enhanced functions of electronic products currently on the market, power supplies are required to provide greater output energy, and at the same time, products are expected to be small in size and light in weight. These trends form two major requirements for power converters: increasing power density and improving conversion efficiency. Based on these two requirements, active-clamp forward-flyback converters and their derivative circuits, which can continuously transfer energy to the output and have flexible switching functions, have been widely used in various power supply products. [0003] Traditional active-clamp forward-flyb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/28H02M3/335
CPCY02B70/1491Y02B70/10
Inventor 刘晏铭
Owner DELTA ELECTRONICS INC
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